/*
 *  Copyright 2012 Iurii Dunko, Iana Potochniak.
 * 
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *       http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *  under the License.
 */
package org.opu.yyminijava.util;

import java.util.ArrayList;
import java.util.EmptyStackException;

/**
 * Unsynchronized stack
 * 
 * @author Iurii Dunko
 * @author Iana Potochniak
 */
public class Stack<E> extends ArrayList<E> {

    public E push(E item) {
        add(item);

        return item;
    }

    public E pop() {
        E obj;
        int len = size();

        obj = peek();
        E e = remove(len - 1);

        return obj;
    }

    public E peek() {
        int len = size();

        if (len == 0) {
            throw new EmptyStackException();
        }

        return get(len - 1);
    }

    public boolean empty() {
        return isEmpty();
    }
}
